A high-precision re-entry guidance method for high-altitude unmanned aerial vehicle

Abstract

The invention relates to a high-precision reentry guidance method for a high-altitude unmanned aerial vehicle. The method comprises the steps that 1, multi-source interface analysis of reentry-segmentaerodynamic parameter uncertainty, atmospheric density uncertainty and gust disturbance is completed, and an equivalence disturbance kinetic model, containing the three kinds of air disturbance, of the high-altitude unmanned aerial vehicle is established; 2, according to the kinetic model in the first step, equivalence disturbance which is conducted on a reentry segment of the high-altitude unmanned aerial vehicle is estimated by designing a nonlinear disturbance observer, and a disturbance estimation value is obtained; 3, a task controlling requirement is met by designing a proportion guiderule; 4, a composite proportion guide controller is designed by using the disturbance estimation value in the second step and the proportion guide rule in the third step, and the high-precision reentry guidance method of the high-altitude unmanned aerial vehicle is completed. The high-precision reentry guidance method which combines the disturbance observer with proportion guide is adopted, has the high engineering practicability, and is suitable for a reentry guidance system of the high-altitude unmanned aerial vehicle and also suitable for a cruising segment and fault-tolerant control of theaerial vehicle.

Description

technical field [0001] The invention relates to a high-precision re-entry guidance method for a high-altitude unmanned aerial vehicle, which can solve the problem of anti-interference re-entry guidance for a high-altitude unmanned aerial vehicle with uncertain aerodynamic parameters, uncertain atmospheric density and gust interference. Background technique [0002] With the development of aircraft technology, high-altitude unmanned aerial vehicles have become a popular research object in the near future, including missiles and hypersonic vehicles. Such objects have the advantages of rapidity, long range, and high precision. [0003] The re-entry stage of high-altitude unmanned aerial vehicles is a critical period of the overall mission process. High-precision re-entry guidance and control are the key technologies in the re-entry process, but they are faced with uncertain aerodynamic parameters, uncertain atmospheric density, and gust interference. The problem severely impact...

AI Technical Summary

Problems solved by technology

Some patents consider the uncertain factors of the re-entry section, but there are other problems: Patent application number 201710370437.8 proposes a robust re-entry guidance method based on linear covariance model predictive control, which solves the impact of uncertain factors on the landing point accuracy , but the model of this method is a linear model, which is quite different from the actual model

Patent Application No. 201610306205.1 proposes an anti-jamming composite online guidance method for the Mars lander's atmospheric entry section, but this method only considers a single source of interference and does not consider multiple uncertainties and interference situations

In addition, there are deficiencies in some papers: the article "Guidance Control Method for Longitudinal Plane Glide Flight of Hypersonic Wind Vehicle" proposes a guidance method based on the combination of dynamic surface control and sliding mode control, but the model used in the article is a two-dimensional plane model , the model lacks engineering practicability, and the article does not consider the problem of high-precision control in flight

To sum up, the existing methods lack the dynamic modeling of high-altitude UAVs under the condition of multi-source interference, and cannot solve the problem of high-precision reconstruction of high-altitude UAVs with uncertain aerodynamic parameters, uncertain atmospheric density and gust interference. entry guidance problem

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